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| author | Pravin B Shelar <pshelar@nicira.com> | 2013-02-11 09:27:41 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-13 13:30:10 -0500 |
| commit | c9af6db4c11ccc6c3e7f19bbc15d54023956f97c (patch) | |
| tree | c596e747d8940b848931ac31701e245a6c0efaf6 /drivers/net/macvtap.c | |
| parent | b8fa4100350432504df438014e2e5e9c1bbb6325 (diff) | |
| download | blackbird-op-linux-c9af6db4c11ccc6c3e7f19bbc15d54023956f97c.tar.gz blackbird-op-linux-c9af6db4c11ccc6c3e7f19bbc15d54023956f97c.zip | |
net: Fix possible wrong checksum generation.
Patch cef401de7be8c4e (net: fix possible wrong checksum
generation) fixed wrong checksum calculation but it broke TSO by
defining new GSO type but not a netdev feature for that type.
net_gso_ok() would not allow hardware checksum/segmentation
offload of such packets without the feature.
Following patch fixes TSO and wrong checksum. This patch uses
same logic that Eric Dumazet used. Patch introduces new flag
SKBTX_SHARED_FRAG if at least one frag can be modified by
the user. but SKBTX_SHARED_FRAG flag is kept in skb shared
info tx_flags rather than gso_type.
tx_flags is better compared to gso_type since we can have skb with
shared frag without gso packet. It does not link SHARED_FRAG to
GSO, So there is no need to define netdev feature for this.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvtap.c')
| -rw-r--r-- | drivers/net/macvtap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index b181dfb3d6d6..97243011d319 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -543,7 +543,6 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, skb->data_len += len; skb->len += len; skb->truesize += truesize; - skb_shinfo(skb)->gso_type |= SKB_GSO_SHARED_FRAG; atomic_add(truesize, &skb->sk->sk_wmem_alloc); while (len) { int off = base & ~PAGE_MASK; @@ -599,7 +598,7 @@ static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { skb_shinfo(skb)->gso_size = vnet_hdr->gso_size; - skb_shinfo(skb)->gso_type |= gso_type; + skb_shinfo(skb)->gso_type = gso_type; /* Header must be checked, and gso_segs computed. */ skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; @@ -743,6 +742,7 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, if (zerocopy) { skb_shinfo(skb)->destructor_arg = m->msg_control; skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; + skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; } if (vlan) macvlan_start_xmit(skb, vlan->dev); |
